/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.bits.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
import com.bits.db.DBConnection;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import org.apache.catalina.Session;

/**
 *
 * @author 3GBITS
 */
public class UserAuthenticationServlet extends HttpServlet {
    ServletContext context = null;

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        RequestDispatcher dispatcher = null;
        DBConnection dbconnection = null;
      //  ServletContext sc = null;

        try {
            context = getServletContext();
            if (context.getAttribute("dbConnection") == null) {
                 dbconnection = new DBConnection();
                context.setAttribute("dbConnection", dbconnection);
            }
            if(dbconnection == null){
                dbconnection = (DBConnection) context.getAttribute("dbConnection");

            }
                String queryString = "select * from users where username =\'" + username + "\' and password = \'" + password + "\'";
                ResultSet rs = dbconnection.getResultSet(queryString);
                if (rs.next()) {
                    dispatcher = request.getRequestDispatcher("userHome.jsp");
                    request.setAttribute("user", username);
                    request.setAttribute("session", "true");
                    dispatcher.forward(request, response);
                } else {
                    dispatcher  =request.getRequestDispatcher("errorPage.jsp");
//                    request.removeAttribute("user");
                    out.println("user in not valid");
                    context.removeAttribute("dbConnection");
                    dbconnection.cleanAll();
                }
           
        } catch (Exception e) {
            dbconnection.cleanAll();
            System.out.println("Exception at processRequest()" + e);
        } finally {
            out.close();
        }
    }
    



// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/** 
 * Handles the HTTP <code>GET</code> method.
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
    protected

void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);


}

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */

        @Override
        protected void

doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);


}

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */

        @Override
        public String

getServletInfo() {
        return "Short description";

}// </editor-fold>
}
